Harman-Kardon II Speaker System User Manual


 
18
MODULUS II HOME THEATER SYSTEM
1. Select a new test position: Cue the test track corresponding
to the center frequency of the dip. In the example in Figure 29
you would play Tracks 14 (52Hz) and 18 (40Hz). Press
Play .
You will see a reading very close to what you had before. Now,
slowly move the RSLM around the area, if possible remaining
within about a foot of the original test point.As you move the
RSLM, watch the bar graph.You will observe large level
fluctuations. Find a location for the subwoofer or a test location
that raises the response at these frequencies.You may find it
helpful to move the RSLM vertically.Dips can be oriented in any
axis.The position that restores the level to about that of the
adjacent test points is your new test position.
2. Reset the test level: Return to the section “Setting the Subwoofer
Test Level”on page 11. Perform the procedure as described.
3. Repeat the measurements:Now that you are familiar with the
measurement process, you can go much faster by using Tracks
27–50.These tracks contain all the test tones necessary for
measurement.However, each test is only about three seconds,and
there is no frequency announcement.The first test is 100Hz.Just
place each test mark in order until finished. Connect the dots.
Your second measurement will no longer exhibit the deep
response dips. However, the peak will still be evident.Without
the influence of the response dips, the amplitude and center
of the peak may have changed.
4. Interpret the new data: Compare your new data to the examples
given in this section of the manual. Follow the instructions for the
example that most closely matches your new measurement.
Example 6. Ideal Response:
If your test data looks similar to the example in Figure 30, you
have a very favorable setup. Skip to the “Final System Balance”
section, page 19.
Adjusting the R.A.B.O.S.Equalizer
Now that you have performed the measurements and interpreted
the data, you have the information needed to adjust the
subwoofer’s equalizer.
There is a R.A.B.O.S. On/Off Switch
¡
located in the top right
corner of the Modulus subwoofer’s rear.This switch must be set
to the “On”position in order for the equalizer controls to take
effect.You can defeat all equalizer controls by setting the switch
to the “Off”position.
There are three equalizer adjustments on the Modulus II
subwoofer.Top to bottom, they are marked
“Freq,”“Width” and
“Level. Each control has 21 positions.These are numbered
from left to right.Therefore, Position 1 is the full counter-
clockwise position.
The table below illustrates all switch positions.
Ideal response,no EQ needed
Position F (Hz) L (dB) W
1 CCW 20 –14.1 4.5%
220–13.9 5%
320–13.5 7.5%
421–13.1 10%
522–12.7 12.5%
624–11.7 16.5%
726–11.0 20.5%
830–10.2 23%
935–9.5 26%
10 38 –8.9 28%
11 40 –8.3 29.5%
12 43 –7.9 31%
13 46 –6.4 34%
14 49 –4.4 39%
15 52 –2.9 41.5%
16 56 –1.9 43.5%
17 63 –1.1 45%
18 66 –0.5 46.5%
19 72 0.0 48%
20 77 0.0 49%
21 CW 80 0.0 49.5%
FIGURE 30
Freq.
Level
R.A.B.O.S.™
Controls
Width